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From: Corinna Vinschen <corinna@sourceware.org>
To: cygwin-cvs@sourceware.org
Subject: [newlib-cygwin] Revert "Cygwin: select: Improve select/poll response."
X-Act-Checkin: newlib-cygwin
X-Git-Author: Takashi Yano <takashi.yano@nifty.ne.jp>
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Date: Tue, 14 Sep 2021 15:07:19 +0000 (GMT)
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https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=b07660ac19f2c5be5ad51d21a969d408dfbf5744

commit b07660ac19f2c5be5ad51d21a969d408dfbf5744
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Wed Sep 8 19:22:40 2021 +0900

    Revert "Cygwin: select: Improve select/poll response."
    
    ... because this commit (23bb19ef) causes high CPU load.

Diff:
---
 winsup/cygwin/select.cc | 32 ++++----------------------------
 1 file changed, 4 insertions(+), 28 deletions(-)

diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index 5e338e43f..c85ce748c 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -726,7 +726,6 @@ thread_pipe (void *arg)
   select_pipe_info *pi = (select_pipe_info *) arg;
   DWORD sleep_time = 0;
   bool looping = true;
-  DWORD t0 = GetTickCount ();
 
   while (looping)
     {
@@ -746,12 +745,7 @@ thread_pipe (void *arg)
 	break;
       cygwait (pi->bye, sleep_time >> 3);
       if (sleep_time < 80)
-	{
-	  DWORD t1 = GetTickCount ();
-	  if (t0 != t1)
-	    ++sleep_time;
-	  t0 = t1;
-	}
+	++sleep_time;
       if (pi->stop_thread)
 	break;
     }
@@ -927,7 +921,6 @@ thread_fifo (void *arg)
   select_fifo_info *pi = (select_fifo_info *) arg;
   DWORD sleep_time = 0;
   bool looping = true;
-  DWORD t0 = GetTickCount ();
 
   while (looping)
     {
@@ -947,12 +940,7 @@ thread_fifo (void *arg)
 	break;
       cygwait (pi->bye, sleep_time >> 3);
       if (sleep_time < 80)
-	{
-	  DWORD t1 = GetTickCount ();
-	  if (t0 != t1)
-	    ++sleep_time;
-	  t0 = t1;
-	}
+	++sleep_time;
       if (pi->stop_thread)
 	break;
     }
@@ -1128,7 +1116,6 @@ thread_console (void *arg)
   select_console_info *ci = (select_console_info *) arg;
   DWORD sleep_time = 0;
   bool looping = true;
-  DWORD t0 = GetTickCount ();
 
   while (looping)
     {
@@ -1148,12 +1135,7 @@ thread_console (void *arg)
 	break;
       cygwait (ci->bye, sleep_time >> 3);
       if (sleep_time < 80)
-	{
-	  DWORD t1 = GetTickCount ();
-	  if (t0 != t1)
-	    ++sleep_time;
-	  t0 = t1;
-	}
+	++sleep_time;
       if (ci->stop_thread)
 	break;
     }
@@ -1373,7 +1355,6 @@ thread_pty_slave (void *arg)
   select_pipe_info *pi = (select_pipe_info *) arg;
   DWORD sleep_time = 0;
   bool looping = true;
-  DWORD t0 = GetTickCount ();
 
   while (looping)
     {
@@ -1393,12 +1374,7 @@ thread_pty_slave (void *arg)
 	break;
       cygwait (pi->bye, sleep_time >> 3);
       if (sleep_time < 80)
-	{
-	  DWORD t1 = GetTickCount ();
-	  if (t0 != t1)
-	    ++sleep_time;
-	  t0 = t1;
-	}
+	++sleep_time;
       if (pi->stop_thread)
 	break;
     }